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It seems this is a current and reproducible bug. The report is here. Until this is fixed, it might not be wise to import .zip files in the sagenb gui if you intend to use the Notebook Exporter to convert them into Jupyter notebook files in Sage 8.0. (Although I have no idea how widespread the problem is, in my case the Notebook Exporter is not obviously recoverable, at least without a reinstallation.) Two workarounds are:

1. If you intend to continue using sagenb, import files individually as .sws files
2. Manually copy the old notebooks into the standard location for sage notebooks and then use the Notebook Exporter to move them to Jupyter. (Be careful not to create any new sage notebooks after the import, as the notebook "counter" will be off.)